rotch ortch rtoch troch otrch torch rocth orcth rcoth croth ocrth corth rtcoh trcoh rctoh crtoh tcroh ctroh otcrh tocrh octrh cotrh tcorh ctorh rothc orthc rtohc trohc otrhc torhc rohtc orhtc rhotc hrotc ohrtc hortc rthoc trhoc rhtoc hrtoc throc htroc othrc tohrc ohtrc hotrc thorc htorc rocht orcht rcoht croht ocrht corht rohct orhct rhoct hroct ohrct horct rchot crhot rhcot hrcot chrot hcrot ochrt cohrt ohcrt hocrt chort hcort rtcho trcho rctho crtho tcrho ctrho rthco trhco rhtco hrtco thrco htrco rchto crhto rhcto hrcto chrto hcrto tchro cthro thcro htcro chtro hctro otchr tochr octhr cothr tcohr ctohr othcr tohcr ohtcr hotcr thocr htocr ochtr cohtr ohctr hoctr chotr hcotr tchor cthor thcor htcor chtor hctor
Note: these 'words' (valid or invalid) are all the permutations of the word rotch. These words are obtained by scrambling the letters in rotch.